Buggy code:
public final class LazyMethodGen { private int accessFlags ; private Type returnType ; private final String name ; private Type [ ] argumentTypes ; private String [ ] declaredExceptions ; private InstructionList body ; private Attribute [ ] attributes ; final LazyClassGen enclosingClass ; private BcelMethod memberView ; int highestLineNumber = 0 ; String fromFilename = null ; private int maxLocals ; private boolean canInline = true ; private boolean hasExceptionHandlers ; private boolean isSynthetic = false ; List matchedShadows ; List matchedShadowTests ; public ResolvedTypeX definingType = null ; public LazyMethodGen ( int accessFlags , Type returnType , String name , Type [ ] paramTypes , String [ ] declaredExceptions , LazyClassGen enclosingClass ) { } private int calculateMaxLocals ( ) { } private Method savedMethod = null ; public LazyMethodGen ( Method m , LazyClassGen enclosingClass ) { } public boolean hasDeclaredLineNumberInfo ( ) { } public int getDeclarationLineNumber ( ) { } public void addAnnotation ( AnnotationX ax ) { } public boolean hasAnnotation ( TypeX annotationTypeX ) { } private void initialize ( ) { } private void unpackHandlers ( MethodGen gen ) { } private InstructionHandle getOutermostExceptionStart ( InstructionHandle ih ) { } private InstructionHandle getOutermostExceptionEnd ( InstructionHandle ih ) { } private void unpackLineNumbers ( MethodGen gen ) { } private void unpackLocals ( MethodGen gen ) { } public int allocateLocal ( Type type ) { } public int allocateLocal ( int slots ) { } public Method getMethod ( ) { } public void markAsChanged ( ) { } public String toString ( ) { } public String toShortString ( ) { } public String toLongString ( ) { } public void print ( ) { } public void print ( PrintStream out ) { } private void printAspectAttributes ( PrintStream out ) { } private class BodyPrinter { Map prefixMap = new HashMap ( ) ; Map suffixMap = new HashMap ( ) ; Map labelMap = new HashMap ( ) ; InstructionList body ; PrintStream out ; ConstantPool pool ; List ranges ; BodyPrinter ( PrintStream out ) { } void run ( ) { } void assignLabels ( ) { } void print ( ) { } void printRangeString ( Range r , int depth ) { } String getRangeString ( Range r , Map labelMap ) { } void printDepth ( int depth ) { } void printLabel ( String s , int depth ) { } void printInstruction ( InstructionHandle h , int depth ) { } static final int BODY_INDENT = 4 ; static final int CODE_INDENT = 16 ; void pad ( int size ) { } } static LocalVariableTag getLocalVariableTag ( InstructionHandle ih , int index ) { } static int getLineNumber ( InstructionHandle ih , int prevLine ) { } public boolean isStatic ( ) { } public boolean isAbstract ( ) { } public boolean isBridgeMethod ( ) { } public void addExceptionHandler ( InstructionHandle start , InstructionHandle end , InstructionHandle handlerStart , ObjectType catchType , boolean highPriority ) { } public int getAccessFlags ( ) { } public Type [ ] getArgumentTypes ( ) { } public LazyClassGen getEnclosingClass ( ) { } public int getMaxLocals ( ) { } public String getName ( ) { } public Type getReturnType ( ) { } public void setMaxLocals ( int maxLocals ) { } public InstructionList getBody ( ) { } public boolean hasBody ( ) { } public Attribute [ ] getAttributes ( ) { } public String [ ] getDeclaredExceptions ( ) { } public String getClassName ( ) { } public MethodGen pack ( ) { } public void makeSynthetic ( ) { } public void packBody ( MethodGen gen ) { } private static InstructionHandle remap ( InstructionHandle ih , Map map ) { } static void insertHandler ( ExceptionRange fresh , LinkedList l ) { } public boolean isPrivate ( ) { } public boolean isProtected ( ) { } public boolean isDefault ( ) { } public boolean isPublic ( ) { } public void assertGoodBody ( ) { } public static void assertGoodBody ( InstructionList il , String from ) { } private static void assertGoodHandle ( InstructionHandle ih , Set body , Stack ranges , String from ) { } private static void assertGoodBranchInstruction ( BranchHandle ih , BranchInstruction inst , Set body , Stack ranges , String from ) { } private static void assertInBody ( Object ih , Set body , String from ) { } private static void assertGoodRangeHandle ( InstructionHandle ih , Set body , Stack ranges , String from ) { } private static void assertGoodRange ( Range r , Set body , String from ) { } private static void assertRangeHandle ( InstructionHandle ih , String from ) { } private static void assertTargetedBy ( InstructionHandle target , InstructionTargeter targeter , String from ) { } private static void assertTargets ( InstructionTargeter targeter , InstructionHandle target , String from ) { } private static Range getRangeAndAssertExactlyOne ( InstructionHandle ih , String from ) { } private static void assertGoodTargeter ( InstructionTargeter t , InstructionHandle ih , Set body , String from ) { } boolean isAdviceMethod ( ) { } boolean isAjSynthetic ( ) { } public ISourceLocation getSourceLocation ( ) { } public EffectiveSignatureAttribute getEffectiveSignature ( ) { } public String getSignature ( ) { if ( ( memberView ) != null ) return memberView . getSignature ( ) ; <START_BUG> return Member . typesToSignature ( BcelWorld . fromBcel ( getReturnType ( ) ) , BcelWorld . fromBcel ( getArgumentTypes ( ) ) ) ; <END_BUG> } public String getParameterSignature ( ) { } public BcelMethod getMemberView ( ) { } public void forcePublic ( ) { } public boolean getCanInline ( ) { } public void setCanInline ( boolean canInline ) { } public void addAttribute ( Attribute attr ) { } }

Fix:
return Member . typesToSignature ( BcelWorld . fromBcel ( getReturnType ( ) ) , BcelWorld . fromBcel ( getArgumentTypes ( ) ) , false ) ;